QA/G-8 provides non-mandatory guidance to assist users in verifying and validating environmental data. The guidance discusses alternative approaches to data validation, including examples of statistics-based validation techniques, and options for verifying that the validated data satisfy relevant claims about their authenticity and quality.

This checklist is designed to be used when reviewing Quality Management Plans prepared according to EPA QA/R-2 EPA Requirements for Quality Management Plans. While the primary purpose of this checklist is for internal agency review and approval of Quality Management Plans, outside parties that need to prepare Quality Management Plans may find this checklist useful. Some of the checklist items may need to be adapted, when reviewing Quality Management Plans prepared by outside parties.

QA/G-4 provides non-mandatory guidance on developing Data Quality Objectives (DQOs) using a systematic planning process based on the graded approach. The guidance presents a step-by-step description of the DQO process. The Aug 2000 version supercedes the Sept 1994 version.

QA/G-4HW provides guidance on applying the Data Quality Objectives (DQO) process to hazardous waste site investigations. The guidance presents a step-by-step description of the DQO process and its application to sampling designs for environmental remediation and waste management activities.

This document can be considered the technical aspect of G-9R. The document is designed as a "tool-box" of useful techniques in assessing the quality of data. The overall structure of the document will enable the analyst to investigate many different problems using a systematic methodology. For more information and resources, see Tools - Data Quality Assessment.